1.2.1161. String Int Comparison¶
While PHP allows direct comparison of integer and strings, with some type conversion, the rules of conversion changed in PHP 8.0. This lead to a change in behavior for comparison.
In particular, strings that are equal to 0, or empty strings, have changed.
This doesn’t affect identity comparison, since the type is initially checked.
<?php
PHP 7 PHP 8
var_dump(0 == "0"); true true
var_dump(0 == "0.0"); true true
var_dump(0 == "foo"); false false
var_dump(0 > ''); false true
var_dump(0 < ''); false false
var_dump(0 >= ''); true true
var_dump(0 <= ''); true false
?>
See also String to Number Comparison.
1.2.1161.1. Suggestions¶
Force a conversion to integer before the comparison to make sure of the behavior.
1.2.1161.2. Specs¶
Short name |
Php/StringIntComparison |
Rulesets |
|
Exakat since |
2.3.9 |
PHP Version |
All |
Severity |
Minor |
Time To Fix |
Quick (30 mins) |
Changed Behavior |
PHP 8.0 - More |
Precision |
Medium |
Features |
comparison |
Available in |